Yes, its cgminer-heavy-2014-03-19-3.zip from 1gh.com and this version also creates a new bin file from a diff cl file. (heavy140319Pitcairngv1w256l4.bin) Old one was heavy140312Pitcairngv1w256l4.bin
In fact, on 7870 (the same chipset with 270) for me it went from below 3.2mhs to 3.7mhs. Does the new version by any chance start with 2 or more GPU threads? (1 is best for this kernel)
possible, i added now "gpu-threads" : "1" to my conf and now it the same speed as it was with the old version (4,2M)