Dave Mitchell asked people to make a list of 5.10 issues that need to be fixed in 5.10.1.

Surprisingly, most of the issues are quite minor. Perhaps the worst is the @_ slowdown (which has already been fixed). Which means that 5.10.0 is looking pretty good at the moment.

The most important thing that will be fixed in 5.10.1 is to nail down some of the edge cases in given/when and smart matching that have come up over the past few months. My advise would be to not go crazy with this part of the language at the moment, in case 5.10.1 changes behaviour that you have begun to rely upon.

The other issue to keep in mind is that the porters are working on getting 5.8.9 out the door first, and that should happen in the next couple of months, as the codebase is more or less in a code freeze for that. 5.10.1 will not get seriously underway until 5.8.9 is out the door.

(That's all speculation on my part, not the summary of any official announcement).