The "actual faithful" part of that thread departed a long time ago, just as I warned the creator it would. Their product will still probably be the closest thing to 4e anyone has cooked up, but it has drifted much more than I'm comfortable calling "actual faithful" anymore.
Edit: it seems I have gravely misunderstood. The last time I read things from that thread, it sounded...pretty dramatically different. Inventing new keywords, altering damage rules. Either things have radically changed, or I radically misunderstood the conversation over an extended period. I'm leaning toward the latter, as concerning to me as it is...
Eh, my understanding is that many terms have been altered, but their usage is consistent with, and reflects 4e usage. There are some alterations in the way the grid and some of the things that happen on it are explained (IE how ranges and areas and some of the details of attack process) but the actual effective result of what is there is virtually identical to what is in 4e. I would expect that if you are a serious rules lawyer the differences would be on the order of differences between the RC and PHB1. That is, some interpretations and rulings ARE substantively different, but its pretty much edge-case kind of stuff and for those who play in a bit less pedantic RAW-splitting mode there are probably no serious differences.
Now, there is definitely some difference in terms of the logistics of encounter building, and the details of XP and thus probably the size of treasures (though I suppose that really could stay the same). Again though, I think the idea is that an encounter drawn up using PHB1 and one drawn up using this system would be substantively similar (one might be an at-level vs the other being a level + 2 or something like that, with the new system hopefully providing a bit more accurate description of challenges at the higher tiers, which 4e's XP budgets were not entirely good for).
So, its not a 100% dead on perfect clone of 4e. However, you should be able to drop 4e powers and classes into it and use them, with no more than altering the terminology and maybe tweaking an effect here or there to make it work right. 4e monsters should drop in, maybe with some changes to their hit points, etc.
However, it will not come with classes and whatnot. Its much like the RC, a description of the mechanical aspects of an FRPG, not a completely fleshed out game.
