The latest models, (Es) that will start with SN R0G00 (Probably April 07) are already being built with the new, longer and shallower feed ramp, (The one at the left) on the barrel:

Click image to enlarge
http://www.ktog.org/cgi-bin/yabb2/YaBB.pl?num=1172087086;start=30#42 They may also have a new or altered magazine and a different slide lock tab system more akin to the P11.
UPDATE: ProModFan received SN R0GXX on March 27 2007. He is the first on KTOG to get one. The E models have started to arrive. So far there are no changes to magazine or slide lock.
UPDATE: As of 03/01/07 there have been more than 1600 PF9s delivered. So far, only 76 of these have come to KTOG.
UPDATE: As of 04/22/07 LIST PRICES have increased.
NEW LIST PRICE ESTIMATED NEW DEALER COST
BLUED from $314 to $333---------------$211
PARKERIZED from $355 to $377--------$225
HARD CHROME from $368 to $390-------$247
UPDATE: As of 4/27, the PF-9 is now available with PARKERIZED slide and barrel. Congrats to Bulldog44, the first KTOGer to get one.
These are good for stealth, but Parkerization inside the barrel may cut bullet velocity some.
UPDATE: As of 5/02/07, more E models have been produced than Total A, B, and C production.
UPDATE: As of 5/10/07 more than 3600 have been distributed.
UPDATE: As of 5/19/07 more than 4300 PF9's distributed.
UPDATE: As of 5/21/07 the PF9 is now available with Hard Chrome slide and barrel. Congrats to Druggie, The first KTOGer to get one:
http://www.ktog.org/cgi-bin/yabb2/YaBB.pl?num=1173849357;start=45#48 UPDATE: As of 6/23 there are 10 cases of trigger spring popping out and about 4 cases of ejector pin slipping out and jamming hammer.
UPDATE 6/28: 6500 PF9s built. 1500 were produced in just 2 weeks. Production is ramping up.
UPDATE: On 7/1 a possible case of trigger-pin-backout right out of the box was reported.
http://www.ktog.org/cgi-bin/yabb2/YaBB.pl?num=1183341062 SIDENOTE: My new HC PF9 (R1Yxx) was born 6/12/07, was shipped 6/21 and arrived at the Dealer on 7/09. So, at least in this one case the PF9s gathered for at least a week before shipping and traveled for 18 days from factory to distributor to dealer. I was lucky enough to find it still there and buy it on 7/10.
I am disappointed that 5 months have gone by and KT is still shipping PF9s with slide lock tabs that hardly touch follower and cut the notch away.
UPDATE: 7/12/07 A new trigger bar with deeper groove for trigger spring is introduced. This should eliminate the "Trigger spring pops out" malfunction.
I estimate that SNs R2C and up will have it.
Quote from PshootR on 07/16/07 at 00:22:08:Stopped by K/T last friday and the gunsmith said there is a new trigger bar for the PF-9 with a deeper groove in it.
UPDATE 7/28/07 NIGHT SIGHTS MAY NOW BE AVAILABLE:
Quote from Q-Gunner2 on 07/28/07 at 01:28:46:I am thinking about buying a PF-9. It is new in box for $279 and has night sights on it. Is this a good price?
UPDATE 8/2 R2Exx arrives at KT. This probably has the new deep-groove trigger bar in it. At least 8,200 PF-9s have been produced.
UPDATE: 8/23/07 more than 10,000 PF-9s have been produced. KTOGers own 328 of them.
UPDATE: 8/26 I expect any day now we'll see a SN R30xx. That will mark the passing of 10,200 PF9s built.
UPDATE 9/25/07: At least 11,400 PF9s have been produced.
UPDATE 9/26: After at least 15 confirmed KTOG instances of PF9 ejector pin walking out and jamming the hammer--KT has come up with a factory fix:
The frame has been strengthened and thickened at the ejector pin hole, and the hole is partially covered so the pin cannot get at the hammer:

Click image to enlarge
Pic courtesy of KuduKing.
Quote from ktwm on 09/26/07 at 16:54:41:There is a factory fix which is currently in the production pipeline.
The fix would be under the "other" category in TPP's first post. basically more frame material is left around the pin and the hole is only drilled deep enough for the pin (Actually half the hole breaks free, so you can sort-of pop it out if necessary).
This will make it more difficult for you to replace the ejector, but it will be impossible for the pin to work it's way out and bind up the hammer. These new frames may allready be out on the streets. I know that some of the first batch of these new frames are being held specifically for repairs.
so if you call customer service and then send in your PF with a note stateing that the ejector pin is walking out, Your frame will be replaced with the new ejector-pin-securing-super-frame.
I'll see if I can post a picture tomorrow.
A major change to the FRAME will make this a new MODEL. Production PF9s with the new frame will be G Models. D or E models retrofitted with the new frame will become F Models.
I estimate that the first production G Model will be SN R3S00, and we should see them in about 3 weeks. (10/17?) That's an S as in Sam, not a five. Perhaps ktwm will be kind enough to tell us the EXACT SN of the production change.
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