Romulan faction announcement including reveals of the Nimbus Adventure Zone and at least one new KDF PvP story mission, with a steady stream of blogs afterwards detailing various specific bits and pieces. The Romulan Faction's blog will reveal it to be underwhelming, but not enough to really dampen the excitement that they're coming. KDF will be righteously angry. All this culminates in a Tribble release at the start of April.
I am prepared to be wrong.
At the very least I'm positive they'll confirm or deny a Romulan faction.