things are looking good - though we aren't working on cudaminer, but rather a fresh fork from the heavycoin cpuminer due to LOTS of stratum implementation differences.
We found nothing in the heavy1 hash function to effectively thwart GPU mining. A few 4-fold divergent code paths are laughable. A minor speed bump at best. Divergent recursive function calls would have been effective - but we found none.
Memory intensive algorithms such as high N factor scrypt seems much more effective at achieving the goal of limiting the GPU advantage.
This coin will be GPU mineable in no time.
Christian
What's amusing is the posts and explanations on the heavycoin thread explaining why GPU mining the coin is impossible.