24 mp seems a bit high, given that the 5DIII and 1DX both have fewer. But, that may be wishful thinking on my part. I'd be excited with 18 mp and clean ISO up to 1600-3200.
I suppose since Nikon is now marketing an entry-level camera with 24 mp, Canon may need to respond, but given the test results of the Nikon, it doesn't appear that the extra megapixels are worth the higher noise.
I never bought the idea that the 70D would replace the 7D, although I agree it seems unlikely we'll see a 7DII before the end of the year (Unless, of course, Nikon releases its D300 replacement soon.)
Anyway, other than the mp count, I'd could get excited about this.