The only revision that we're most likely getting is a console with removable/attachable external disc drive.

If we're talking a PS5 slim.. it could be that they just keep all as is, but change the form factor to a more basic design with a different take on the cooling.

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PS5 pro.. won't happen anytime soon, the console is too expensive too make, so an upgraded console would be too expensive.

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So essentially the question is: is it a good time to buy the PS5 now?
Yes.. the new models won't be significantly different and they for sure won't be a lot more powerful to a noticable degree.

The PS5 pro won't be here for 2 years and the so called revision with an optional drive.. well you can just get a PS5 disc right now.