The 20U will be the next series after the 12U of each model.
TH(42)(50)PF20Us will be out first around April because the 42 and 50 PF models will jump from 11UK --> 20U skipping a 12U model. The others will follow throughout the year roughly on the anniversery of their counterpart
12U introductions.
I found this at the AVS Forum.
http://www.avsforum.com/avs-vb/showthread.php?t=1154924&page=5
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BV4-50, Beosystem 3, Beolab 5, Beolab 3, BV3-32, BV1, BS9000, Beolab 4, Beolab 2000, Beo4 Cinema