Root and link to SD, or wait for Android M?

Do you think we'll get Android M soon? I'm asking because I was thinking on rooting my device to make a partition on my SD and link apps and data to it, but, supposedly, Android M will allow to "adopt storage", which is the same thing of linking files to SD (correct me if I'm wrong) without the need of root access .

So I don't know if it's recommended to wait for Android M and keep my bootloader locked (to preserve the warranty), or root my device in the meantime while we get M.

I'm not urgently needing more space right now, but I would like to have more space and download some games that I can't because of low internal memory.

Thanks. And sorry if I made mistakes, English isn't my native language :)