I have no idea. Some manufacturers just run out of stock at Christmas, nothing new.
We have the MT25 and MT30 in demo, so no problem there at all. They usually get used with Yamaha, Denon or Pioneer between the £1k and £2k price point. They can be used with pretty much any AV amp really as they're not hard to drive or anything, so you could use them with an Onkyo 607 or Denon 1910 for example. The M&K package would require a more capable amplifier in comparison to the B&W's.
Anyone on a strict budget, I'd recommend the MT25 rather than the MT30 and use the saved cash on a better receiver to get more from the speakers. As I have said, speakers can only sound as good as what's driving them.