According to Mirrorless Rumors, both shooters will be announced officially on October 16th. The A7 will come toting a 24MP sensor with Phase Detection AF and an anti-aliasing filter for $1,600-$1,700 for the body only and $2,000 with a 28-70mm kit lens.
The A7r, on the other hand, will have no anti-aliasing filter and sports a 36MP sensor without PDAF on-sensor. The A7r is expected to run you $2,300-$2,400 for the body only (no word on kit price). Both cameras will be about the same size as the current RX1.