These news make me very happy. I would like to congratulate softcoder and silnarm for this open minded and courageous step, and would like to express my appreciation for their indirect offer of spending many hours to create a working, merged build. I'm sure this will be fun, too, and I am looking forward to be part of it (if not by contributing to the core development - just like now).
Regarding the community, and the many questions which automatically come up with this discussion, I'd like to point out that it will be a while until such a merger results in a release, and most of the questions that come up as a side effect of the merger do not need to be answered right now - we have lots of time to do so. Of course, we can start to discuss these things now, but let's take some time with it, remain calm, and work out the best ways.
The most important thing for the community to do right now is, as softcoder put it nicely, to think of everything with the word 'glest' in it as one entity. Those of us who do not really know the other part should probably try to get to know it (pointing at myself there). And those who already know both parts should try to move their affection for one of these project to the whole. This can be difficult at the start, but it is totally possible, and will get us much farther.
Finally, I have one request to make to my friends of this united community, which is to not insist in discussing all the details of the merger now. If we request precise statements on how things will be handled now, we effectively decrease the options the unified core development team has in working out the best solution. Let's not force them into public statements on how exactly this merger will take place at this time, but be patient and see how they work things out for the benefit of all of us.
Of course everyone should state their general opinion on the merger, just let's not discuss too many details, yet. This merger is a small and weak plant for now, and it needs lots of good care to grow strong, by all of us. Let's grow it!