the RPF simply cannot pre-announce a compute module revision 2, as their production/sales partners (element 14 & RS components) would sue them because the sales of the normal compute module would immediately stop!
This is a market that prefers long term plans and buy more processor's/boards of the current generation when there are known plans for new compatible hardware. Every time a soon to come product is put on the release schedule; sales of current products goes up. Because we know that upgrading is an option.
What makes you think that sales of this module would drop if you had a road map, when history and logic implies an increase in sales?
This is not the consumer market where lack of plans is widely accepted. This is the embedded market where many of us are buying modules that costs ten tomes what the rasppi costs - because we know that upgrades will be available in the future.
The purchase cost are irrelevant compared to the cost in labour when having to redesign the entire system in order to replace a cpu module.