Battlefield 4 was announced last year during Medal of Honor: Warfighter Multiplayer trailer reveal. It was later confirmed the full game will be launched in 2014 and Battlefield 4 Multiplayer Beta to release in Fall 2013.
During last night's EA's earnings call, EA Labels president Frank Gibeau said:
"We've already talked a little bit about that we have a Battlefield title coming next year, but we're not in a position right now to talk about our development plans and our SKU plan long term. That will come in about 90 days when we get to show you some Battlefield stuff."
Gibeau's comments suggest that EA is gearing up for a late-April reveal for Battlefield 4, a few weeks after next-generation consoles are expected to be announced by Sony and Microsoft around GDC. Battlefield 4 is also expected to be a next-gen title along with possible release for current generation consoles.