Well, this issue brings up other issues :o)
From my 2 years experience with q2a and using this forum here over and over again, being in PM-contact with the main developer regularly I conclude, by Nov 2013:
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the q2a core is only developed by Gideon Greenspan, see user gidgreen
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q2a is not his main project so he is spending his "free time" to bring q2a further
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he tries to help by answering recent questions from time to time
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but as he is alone he cannot manage all requests (which brings disappointment to some dev/users)
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that is why I would suggest to build a developers team soon
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however, documentation is not easy for beginners, I still don't know how the core really works
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but nevertheless, I learnt to handle the q2a engine (see my plugins)
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Scott and NoahY are really good plugin developers and could help with the core as well (however, NoahY seems to not be active for some months)
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jatin.soni arrived last year as well, and is also passionate about q2a (see q2amarket.com), as well as sama55 who also develops plugins
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and there a lot of other developers coming to the forum (and leaving again)
This is just a 100 % "writing down" from experience and ideas.
The requested roadmap would be great, of course, but I think gidgreen will not be able to do it. Especially if he does it he could be blamed by others, why he did not solve bugs x and y in time etc. Kind of stress.
I am eager to use the next 1.6.3 for another project, finding bugs, and still improving things. But I have no idea when he will release it.
So, for now and for the recent future, I think this will not change. On the other hand, I like to be surprised =) but at least I would see a bug list on github. The bug tag here in this forum that gidgreen asks developers to use is just not powerful enough (solved bugs are not marked and appear still open).
My two cents, hope they help.
Kai
PS: 3 weeks ago I sent gidgreen all my core hacks, about 30 to 40. It might be (at least I hope) that he is implementing most of them into q2a. The hacks make things easier, esp. usability of the forum. Maybe this is the reason why the next release takes longer.