Several points well made!
Sure, he's got a lot of work on at the moment, but if this was all well planned, he should have finished the music before the announcement and made plans for album/singles releases already.It really would be crazy not to release anything new during this concert run, even if it is a UK only release to coincide with the concerts.
BUT the way things are going it looks as though he hasn't got any plans to release new music soon (I think we'd have more solid information/rumours by now). If nothing's complete now, he won't have time to do it until the concerts are over. In fact, if this concert series is extended to other countries, potentially for up to 2 years, then we may not hear any new music until 2011/2012 at the earliest. That would be terrible and show a real lack of foresight/planning/common sense.
There was mention a while ago that the album was shelved because nobody took much interest in 'Hold My Hand', which was purposefully leaked to guage public interest in new MJ music. If that's true then it is a shame that Mike didn't realise how popular he could still be. Mike wants nothing short of domination in the chart and that's not realistic these days. He should just release an album, promote it properly and be happy with whatever happens. Nobody expects Madonna, Prince, or Elton John to sell mega-millions of copies anymore, so why should Mike? Releasing something toward the beginning of this concert series is the best time IMO. He can promote the album while promoting the concerts via interviews or competitions in papers, websites, or magazines. Kill 2 birds with 1 stone!