Updates have slowed on it (I haven't had the heart to nag them because they've been so busy with beta 7) but they're continuing to make good progress on it, e.g. https://twitter.com/DamianEdwards/status/632000189818007552

"Kestrel hit 151k RPS just now for plaintext test with pipelining (depth 16). Lots of known things to fix still, big gains to come #aspnet"

"have a fix in the works that'll give us another 5-10% & a list of other things to attack after that. Fun stuff :)"