That official changes will invalidate mods and therefore break mods.
The worst being crashing.
[edit] oh and possibly tools and utilities don't work 100%,
Nope. Patch 1.8 doesn't break much. Old mods will continue to work, but they CANNOT be updated right now until the CK update comes along, hopefully in the next few days.
TES5Edit is already compatible with the new info found in 1.8 so that's safe to keep using.
Since Wrye Bash is slightly upset with the new Update.esm, I guess we'll be cutting an official 301 for that later today.
Im waiting till skse updates then i update skyrim

SKSE updated last week when beta 1.8.151 came out. Use that, it will become the live version without you needing to do anything.