I just saw today that the Series 2 of the Kreon Microchangers have just appeared at BBTS.
Until people start getting them, I'm not too sure which 12 are in this wave, as the images at BBTS are different to the 12 Hasbro announced at Toyfair in January.
UPDATE - codes and names
66 - Bulkhead
67 - Hardshell
68 - Blight
69 - Arcee
70 - Acid Wing
71 - Vehicon
72 - Scourge
73 - Powerglide
74 - Perceptor
75 - Lugnut
76 - Hoist
77 - Groove