BB - I would imagine that BA will be looking for 747-400 type rated pilots initially but there are many DEPs on the 744 right now who did not have a 744 type rating when they joined. For most 744 rated pilots, joining BA will involve a large reduction in basic salary.
Under our present pay structure, DEPs are on frozen pay for the first 4 years, followed by 3 years of pay increases to eventually put you on the full F/O pay scale after a total of 7 years. The idea being that BA can recoup their training costs (which is a bit odd if you already have the type rating). If you consider take home pay, a DEP would be far better off joining on the 737 fleet at LHR. If you are in the holding pool you stand a chance of a 744 slot.
I feel sorry for those pilots at BA who have been waiting for a chance to join the 744 fleet. As Harry W has mentioned, this is a complete 180 in policy.
RVR800 - can you please explain the relevance of your 80,000 Euros comment?