The 60D and 7D are in NO need of an update.
If they bring a new sensor out for the 700D then there will be a need for update. The 60D needs updating to bring it back in line the XXD previously were. Was a disappointment for most XXD users. I agree with the 7D but then it would be nice to have a better sensor in it. I would buy it then. No point in buying something new for the IQ to be worse than previous models.
Honestly, a 7D with nothing more than the Digic V would be a notable improvement. Not 'sell your 7D' improvement, but it would definitely be worth putting out if there was nothing else in the pipes.
From another thread:
Note that there are two 'flavors' - Digic5 and Digic5+.
The new Digic 5 processor is 6X faster and creates 75% less noise than the Digic 4 processor.
Compared with the predecessor, Canon's DIGIC 4 Image Processor, the Dual DIGIC 5+ Image Processor offers approximately 17x faster processing speed, and feature new algorithms that promote greater noise reduction at higher ISOs.
Looking back, they could easily get away with making a 70D that's only improvements were Digic5 and re-adding MFA . . .