I admit that the last time I touched psionics was at least an edition ago.
But I would probably follow the same guidelines, off the top of my head:
If using the ELH/SRD rules, divide the final Psicraft DC of an epic power by 4 to get an equivalent power level.
Continue the power point cost progression for powers of 10th level or more ((2*level) - 1)
Grant power points and powers known to classes past 20th level (extend the tables)
Metapsionic feats used as the basis for converting non epic powers to epic powers
Different modifications available to convert non epic powers to epic powers.
There are other things that will be in the final published document that I can't get into at this point, but the parallel is quite evident.
Psionics won't be covered in this release, unfortunately. I had thought about it, but the sheer work involved in addition to the magic system gave me pause. Perhaps a psionic edition could follow, if there is interest.