It is a reasonable guess , Sky wont want to lose viewers to another channel showing a free highlights package which is shown at the same time as their highlights programme.
Er, isn't MoTD broadcast about 18 hours earlier than Sky's 'Goals on Sunday'?
From what has been announced today, there is NO reason to suggest (yet) that this will affect the FLS or the BBC internet site.
Also, the deal announced today starts in 2012/13, not next season as some are suggesting.