Battlefield community, producer Gordon van Dyke has revealed in a G4 interview

that Battlefield 1943 for PC has been delayed until Q1 2010.

He also mentions that the PC version of the game will support up to 32 players.

G4: Why is Battlefield 1943 launching later on the PC? In retrospect, was this the right decision?

Dyke: We haven't released a Frostbite [DICE's game engine] built game on PC, so going into this project we lacked a starting foundation we had on Console. There are also many different and unique only challenges to the PC that has lead to us pushing the release even further to Q1 CY 2010 [early next year]. This was a hard pill to swallow, but it was absolutely needed to ensure the features and functionality that PC Players have come to expect from Battlefield on PC are not missing. Things like support for DirectX 9 and 10, higher player count (up to 32-player matches), wide peripheral support i.e. Joysticks for flying, VoIP, and ranked server provider hosting. So it was and still is the absolutely right decision, for quality sake, to not release until it is ready.

You can read the full interview here.