Gronkling hasn't been active in a while. What's going on with him?
Actually, I am interested in that as well. I am currently trying to reach out to him (forum pm and YouTube message) and asking for a "status update" -- if he has lost interest in Lemmings or simply has a ton of stuff to do.
I also included the question - when a person asks for it, that a beta version of the pack can be sent out to them. Such a version shouldn't be handed around without permission, therefore without an ok from Gronkling the pack shouldn't be spread.
As a beta tester I can also tell you about the current situation of the pack:
- It already got multiple patches that fixed quite a few backroutes, but a bunch of levels still need to be fixed a bit. Pesky backroutes!

- In the last update I was able to solve all of the levels (they are really a challenge), so I can confirm solvability in the
old format version. All in all it's a really good pack.

So I am hoping one of my messages reached him and I will be able to hear from Gronkling soon. Then I or even Gronkling himself can give info about the situation. Also, when and only when I get an ok from him I could hand out the latest beta version on request via pm.