Battlefield 2 Forums offer a status report on the incredibly tardy version 1.50 patch for Battlefield 2 first mentioned back in June 2008 (thanks Paul). The latest word is that beta testing of the patch should begin by the end of this month, recalling an unfulfilled promise in November that beta testing of the patch would begin by last Christmas. Word is:

Firstly, sorry I have been away for so long, its been a busy time. So here as per request in a number of threads here is an update to where we are with 1.50.
Yes its still coming
We have been working on a few things to do with DRM as old versions of Battlefield 2 use an old version of SafeDisc
We have had a number of last minute hacks appear which we have made fixes for to help stabalise the servers.
We have a minor issue to solve with the Chinese version of the game.
While I can't give an exact date, we are aiming to release our first Beta towards the end of April '09 as long as everything else goes well.