http://toolguyd.com/milwaukee-tool-the-next-breakthrough-nps18-teaser/
This could be concerning. After 10 years of the M18 platform is Milwaukee about to leave us behind and release a new battery environment?
I am 99.9999999999% certain that they're not close to even the suggestion that they should move away from the M18 platform.
But I think that a higher voltage solution is in the works. It should be, if they don't want to be left in the dust. A year ago they were still working on things. Now, they should be ready to announce developments, and maybe even some new tools.
There are 3 ways other pro-level brands have introduced higher-voltage tools.
1) 2 batteries in series with complete compatibility (or near complete)
2) Switching battery pack with one-way compatibility
3) Completely different platform with zero compatibility
Option 3? Milwaukee all but abandoned their M28 platform. I don't see them launching a new platform independent and separate of M18.
Option 1? That would allow them to remain near fully compatible with existing M18 tools and system components.
Option 2? I think they are clearly opposed to this, because of the 1-way compatibility. Dewalt FlexVolt and Hitachi MultiVolt are downwards-compatible, but not upwards. You can use the higher voltage battery packs with the 20V Max and 18V tools, but you cannot use 20V Max or 18V batteries with the higher voltage tools.
Festool has a cordless saw that works with 2 battery packs. Equip it with 1 battery, and it works in "turtle" mode. Equip it with 2, and it works in "hare" mode. It would be interesting if Milwaukee does something like this, but I don't think they will.
But, any developments that they announce will definitely be building upon M18,
and NOT replacing it.