Texrat, I think we understand each other on this.

If for instance I am a Samsung fan, and I am looking for a new phone, based on the fact they are releasing android phones this year, I am apt to wait to see their offerings. If that information isn't public, I start looking at other options and Samsung looses a sale.

With Nokia, I don't think that the RX-51 is what I'm looking for, so I am looking at alternatives. If I buy an alternative and the RX-51 would have been OK, I'll be upset, but I won't rush out to buy one. I also have no idea if the RX-71 would be what I'm looking for, IF it ever makes it to production. If I knew it was going to be a tablet form factor, I would probably wait for more details before making a purchase. With no info available on the RX-71 it currently isn't a consideration.

A high level roadmap, even if vague, has value as a marketing/advertising tool in addition to (or in lieu of) traditional advertising.