Just looking at the Nine schedule (or trying too - finding that info is difficult enough in itself!) will The Footy Show also rule out Thursdays for BB? If that's the case surely it is going to have to air on Sundays until The Block finishes, airing Sun-Wed, unless they pull The Block from Thursdays. Evictions would be better on Mon though as they'll have half the week to cover in the Sunday show. However they do it it is going to be an even bigger mess than last years scheduling, which seemed to change every couple of weeks.
If Nine had any kind of sensible multi-channel strategy the wisest thing to do would be to use GO! or Gem for 30 minute daily shows at 7pm, and then Nine schedule as they are going to anyway - basically squeezing it in around The Block.
Quick question - what would you prefer: 12 weeks of BB airing four nights a week or 8 weeks airing 6 nights a week, if that can be squeezed in once the footy and Block are over? It would be the same number of episodes, so I think I would lean towards the latter.