If they gave u a date, then blank out PwC till then. The 3weeks sounds like last week of August. That also sounds like assumption of office 1st monday of September. I can totally imagine the feeling. No, not even 'imagine', 'remember'. I did call HR then and I think I asked what's up with the process (not exactly in those words sha) and they said nothing had happened, that if something came up, I'd be contacted. I imagine the response will be the same.
@troublemaker, true words. Life goes on, whatever happens. And it can get even better.
@Ufuoma77, Nk-chi's and troublemaker's advice is cool. Try to 4get u r waiting for PwC... don't spoil the surprise!
Enjoy...