To be very frank, we cannot say what will be the upgrade price for CS6.5 as it's not yet launched and is still in progress, So, we have no clue about the princing as of now. No-one has seen the future yet.
Now, as per your 2nd question, you cannot upgrade from a subscription to a perpetual product. You need to cancel the subscription and place an order for the perpetual product.
Hope that Clarifies your doubt.
Arprit this is question I have raised elsewhere the issue is not how much an exit strategy would cost it is people who have invested in Adobe products in some cases for many years are concerned about loosing their investment buy joining the cloud. The question is at some point in the future should we have to exit the cloud would Adobe provide an exit strategy or would the be left with no acces to software at all.
If you consider that the cost of a normal could subscription compares with the annual cost of upgrading the cs product.
With the cs product you will have access to the software untill your os or computer no longer supports it
So say in 10 years time I had to exit the cloud through I'll health or any other reason which meant I could no longer afford the subscription. Would the subscription count as a potential upgrade qualification to the perpetual product Or on a retirement case could some end a subscription with the last version of the software.
The point is the cost would be similar either way but at present it would seem that joining the creative could wipes out all your previous investments in adobe products which is significant and the incentive to join really does not compensate for the value of that investment.