Very possible the Next rMBP not only to have Haswell, but 3200x1800 resolution IGZO panel, and redesigned body w/o HDMI port, and instead one extra USB and one extra Thunderbolt port or an FW800 port (both in place the HDMI port).
Reason: Early this year a rumour about sligth body redesing for haswell rMBP, second Haswell chipset production starts in June matching the IGZO production start, finally haswell support 4 USB3 instead 3 ports supported by ivi bridge, as 4 Thunderbolt port, Also Apple
return to support FW800 is very likely coz was keept on the new iMacs and mac minis.
Availability: Late Q3/Early Q4
Reason: Early this year a rumour about sligth body redesing for haswell rMBP, second Haswell chipset production starts in June matching the IGZO production start, finally haswell support 4 USB3 instead 3 ports supported by ivi bridge, as 4 Thunderbolt port, Also Apple

Availability: Late Q3/Early Q4