We are currently working on the flip screen bug fix affecting iPhone 4, other models should not be affected. The fix itself shouldn't be too hard to make, we just hope it goes through Apple swiftly too. We plan to release support for Game Center at the same time. This naturally means the leader boards will be reset as we change the current system to kills instead of score.
As a side note, we are not trying to offend/disrespect/ignore anybody by releasing an update that does not benefit people with older generation devices. Making the game support Retina display is very important for the future development of the game as the amount of older devices will become smaller. In the Retina display update there was also a bug fix that DID benefit everybody. Especially the owners of older devices. The explosion of the crates lowered framerate and sometimes crashed older devices. We changed the explosion so that it is no longer as demanding on the hardware.
Retina display and framerate support for iPod touch 4 is being made too, we just got ipt4 to the office.