Looks like TakaraTomy are still keen to release big box-set Encore TFs after the apparent failure of Metroplex. According to Bigbadtoystore, the next Encore release after the cassettes, will be the original Combaticons as a 5-pack.
http://www.bigbadtoystore.com/bbts/p...09&mode=retail

Expected release is June, which is right on the release of the movie, which could affect its sales if the movie toys are released in Japan at the same time. Hasbro at least plan to suspend their 'nostalgia' series (Universe) during the Movie period.

BBTS's price is US$95, but expect it to be about US$80 from more direct (asian) sources.