There are two entry points... Minion Mayhem & Fallon Restrooms. They both connect through the soundstages so it effectively becomes a walkway.
However, I'm not exactly sure how that walkway in front of BMG will be handled as that is a really tight area with Rockit construction in the way.
The walk from Minion Mayhem to Terrifier is roughly the same as exiting the new parade building and to the ET exit. The benefit is that you can just walk a few feet to then enter Grave of Flesh or walk a 2-3 minute walk to FNAF/WWE
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In summary, if you want WWE/FNAF enter by Minion Mayhem. If you want Terrifier/Grave enter by Fallon restroom.
I really like this idea (as mentioned in years past) of "expanding" the event outside the main park pathways so that the zones have a little more room to breathe in while pushing the "decision point" backstage instead of guests backing up main pathways.