Battlefield 3's limited edition contains a promotional insert for Medal of Honor, indicating that game's promised sequel is due soon, if not around this time next year.
The insert appears at 3:39 of this video. The card is just a logo, but it has an ESRB Rating Pending badge on it, meaning it's unlikely this is a promotion for the existing game or a re-release of it.
In February, Greg Goodrich of Danger Close said the studio was working on the next instalment of Medal of Honor. It would seem to put Electronic Arts on a schedule of rolling out a military shooter every year while alternating installments of its two big franchises.