Since last fall's core sprint in London, Pablo Galindo Salgado, Lysandros Nikolaou and myself have been working on a new parser for CPython. We are now far enough along that we present a PEP we've written:
Hopefully the PEP speaks for itself. We are hoping for a speedy resolution so we can land the code we've written before 3.9 beta 1.
If people insist I can post a copy of the entire PEP here on the list, but since a lot of it is just background information on the old LL(1) and the new PEG parsing algorithms, I figure I'd spare everyone the need of reading through that. Below is a copy of the most relevant section from the PEP. I'd also like to point out the section on performance (which you can find through the above link) -- basically performance is on a par with that of the old parser.