Icom makes good stuff, but they consistently lag W-A-Y behind everyone else on the new products. The only entered the 7/800 market in the last few years. They have some nice P25 products, but nothing that would convert well into the multiband market. Icom is usually at all the big trade shows, and I've never seen anything that would suggest they are working on such a product.
It would (obviously) be an entirely new product line, not like anything they have. That's a lot of development costs, and the market is going to be really well saturated here shortly.
Icom seems to like to hang back quite a ways.