For what it's worth, if you look at the specs..
The APQ8060 is Qualcomm's 45nm dual-core Snapdragon with Adreno 220.. with NO modem.
The radio is Qualcomm's MDM9200.. which is a standalone modem chip that provides the UMTS connectivity.
This is different than most of the Snapdragon SOCs which have the modem as part of a single chip, making it difficult to add any secondary connectivity.
A setup like this is basically similar to the HTC Thunderbolt (but different than the Charge or Revo).. except that the Thunderbolt uses the MSM8655 (which includes a full 1x/EVDO baseband.. but is only used for 1x). The Thunderbolt uses the MDM9600 for LTE connectivity (same as the MDM9200 plus support for CDMA radios.. 1x/EVDO), unfortunately duplicating the function of the MSM8655 1x/EVDO basebands..
Perhaps all this redundant silicon is what causes some of the power hunger of the Thunderbolt.
You could extrapolate that this means the way is paved for a simple architecture in a EVDO capable Galaxy S II.. because it simply means replacing the MDM9200 with a MDM9600. No worries about integrating the existing baseband.
The sacrifice is still no simultaneous data and voice/text when connected ONLY to 3G... but I think everyone is willing to live with this at this point. Only the Thunderbolt is capable of this.. not even the Charge or Revo..