Seems like 'what is, is' is a lot like saying 'black is black' in that it doesn't actually say anything. The only distinction may be that 'black' at least defines what it is, whereas 'what is' doesn't.
So, what is? Is 'what is' what you perceive it to be, or could it be something else? Is the idea to accept what actually is, or to accept what I perceive?