Thanks for that Terry - I think they've taken it away now though!
AS for the OP - I've had mine since November 5th, I do have the sensor 'stain' issue, and when the dust has settled I'll get it replaced. However, I can only see the marks in skies over f11, and when it's there it's no more of a problem to deal with than any dust bunny - not excusing it, just putting it in perspective.
Focusing in tungsten light is the other reported issue - I've not found it to be a problem - again, not denying it, and I'm sure it's readily repeatable in testing, but I haven't bothered to do those tests, and I've been getting a good AF hit rate in very poor light - maybe it's something to do with using the AF assist light - I've switched this off, as I'm not keen on subjects with the expression of frightened rabbits!
Put it this way, I'd like to see these things fixed, but in my real world photography they are non issues, and I've no doubt they'll be sorted out one way or another.
Again, I'm not trying to say that it's perfect, but it's a fine camera which works very well - if you want what it has to offer (small / weather sealed / pro spec / very quiet) then I think it's already ready.
all the best