In my opinion these will most likely be digital channels as SAB group has not quite been successful in expanding its TV Channels as all their Dabangg (Bhojpuri), Dhamaal (Gujarati), Dillagi have not performed well and now running mixed content + distribution remains to be limited to select platforms.
If indeed Masti+ and Maiboli+ r launching as TV Channels then maybe. Masti+ will be a music channel featuring mostly new songs and maybe movies thus catering to new age young audience and Maiboli+ may be a Movies+GEC channel.
I just hope music channels add Indi Pop songs to their content mix, these songs r really good, melodious , evergreen & delight to watch/hear + they enjoy huge appeal among large section of the audience.....also one more English Music Channel is much needed....yes in age of internet / apps / YouTube one can always listen/watch their favorite songs by searching for it but nothing comes at par with experience of watching back to hit good curated song collection on TV Channels