erm, well I am not holding my breath, and I bet much of the country still wont get HDfreeview even in 4 years time (for the same reasons + cost that not everyone can get normal Freeview now). Dont bother waiting and go for either subscription based Sky satelliteHD or Cable HD, or get a non-Sky satellite SD/HD box and tune into the 1 or 2 free channels today. 4 years - this is really a non-issue, especially if you need to replace your normal tv in the next 12 months.
Dave