Here's the link to the upcoming Solaris 7 patch notes-
https://mwomercs.com/news/2018/04/2038-patch-notes-141590-17apr2018
Link to List of Solaris 7 Divisions can be found below (basically only 'Mechs within the divisions will have a chance of fighting each other, you shouldn't see any inter-divisional matches)-
https://mwomercs.com/s7-mech-divisions
Quick hits/take-aways (not including Solaris 7 events):
Map Temperature Changes (there are changes to Faction Play maps and a few of the maps accessed via the private lobby but I'm not posting those here; additionally, map temps below are from hottest to lowest)-
Terra--------->98
Tourmaline-->75
Caustic------>67
Rubellite---->59
Canyon----->27
Viridian----->23
Forest------->21
River-------->15
Crimson----->13
Mining------->11
Grim--------->-9
Alpine-------->-21
Polar--------->-29
Frozen------->-45
HPG---------->-69
NERF ALERT!
All Clan MG's are having their Critical Chance and Bonuses reduced (Innersphere are appearently unchanged). Both Clan/Innersphere Hvy MGs dmg are being increased from 0.14 --> 0.15
Tweaks to Flamers --> Heat penalties added for firing more than 4 at once and changes to how they function in Solaris matches specifically (see above link for that info).
Further Weapon Tweaks
All Innersphere and Clan LRMs are having their base velocity raised from 160 --> 190
Bug Fixes and Improvements (most notable)
Sun Spider Hit Boxes adjusted (no specifics)
A few changes to MASC to make it more efficient, fill rate and dissipation rates decreased/raised by 10% respectively.
A few tweaks to Class I & II Jump Jets so that all classes of Jump Jets perform consistently across all weight classes.