Will 8.2 / Threshold be free at least for W8 users

Was W8.1 a one time only free OS or did MS employ the strategy of making .* updates free to facilitate adoption.

I do hope its the latter, MS could give away the 8.1 to 8.9 releases for free to 8 users and charge the rest. After all .* are seen like service pack updates aren't they?

Is this the case?