Update 2: It’s been confirmed that the sukkiri exploit, and most likely the Kernel exploit used in the Hen have been patched. It’s also been confirmed that we can still run signed homebrews on 6.37.
Update 1: firmware 6.37 is now available and can be found here. Do not upgrade until further notice, if you still want to use homebrews!
Sony’s Eric Lempel announced today the upcoming firmware 6.37 for the PSP. This update will “improve system software stability during use of some features”, a.k.a. patch the Kernel exploit used in the Hen, and probably the sukkiri exploit too. (how about the recent signing stuff?)
If you use your psp for homebrews, I don’t recommend to upgrade your system until more information is available.
source Playstation blog, thanks to David N. for the tip!