Zerrix, to me personally, I take the announcement as a positive...I'm taking the point of view that if it is taking them until Sept to release the next firmware update, then it should be a beauty! I could be dreaming, but I'm hoping for something special...maybe all games working without patching, different interface (eg. sakura-like), SDHC support?...maybe even more surprises.
Irrespective of what happens, the cart works flawlessly (sure, without any recent firmware upgrades a few games currently need the ARM7 fix to work, but that isn't a problem to me at all).
With respect to a new firmware bricking your DS, I guess it's possible....but to me that would be commercial suicide. Just imagine it, every DS forum would get flooded with users bagging them and the R4 team would struggle in the market thereafter (even if they changedtheir name, people in the know would still find out and alert everyone). It would also raise the point, could they be sued by a collective mass of users of an authentic R4?
I think the general consensus would be to wait after any future firmware release to see it's impact. I'm sure there are testers, impatient users, etc. out there that will let us all know soon enough if everything is okay.