Following features should be added in the CI3.x upcoming versions

#2 and 4 are likely to stay in the realm of 3rd party libraries for the foreseeable future (and #4 is definitely not in the realm of most people's idea of a framework).

#1 is debatable for CI4, but probably has little chance of happening in CI3, especially since it's already supported by 3rd party libraries (which will probably be where it stays for CI4).

#3 may happen over time, if people can identify areas which can be improved, but there are limits. Certainly, no one intends to make it slower.

Bonfire

Practical CodeIgniter 3
CodeIgniter Testing Guide