Battlefield 2142 update 1.51 is still in development, however the programmer required to finish the update is busy working with the team on finalising Battlefield Bad Company 2. Once BFBC2 is complete we will get the programmers time to finish the final bug fixes on Battlefield 2142.

Things we have left to address before release are:
Dedicated servers are listening on all ports for VoIP instead of the one port defined in serversettings.con
Running more than one server on a machine causes each connection to the additional servers to slow client loading. It can take up to 1 hour before the map loads.

These are bugs introduced in 1.51 changes and not existing bugs in 1.50 but we have to fix these before release.
As well as the update we will have the programmer create a new Battlefield 2142 Deluxe with 1.51 included for release on digital distribution systems beyond EA Download Manager. This will happen after 1.51 has been completed and released though.
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This was made Yesterday, 11:03 AM so we could be expecting a patch sometime after march.

http://forums.electronicarts.co.uk/battlefield-2142/871946-2142-update-1-51-a.html