Cross posting from WotC since the forum is apparently going down for a week and people have been curious about this for a while...
---
Now that the new FAQ is in place, I can finally discuss this issue publicly as it's no longer a problem.
First, the new rule is that the beveled corners only impact movement. They are treated just like a normal corner for LOS.
So here's the basic situation from the previous rules as LOS is interpreted across a beveled corner. The corner can be legally drawn across if it's beveled where if a standard corner replaced it there would be no LOS. It really had almost no impact as normally considered. Death Star changes virtually nothing, and Mos Eisley and Bespin have a few new LOS 'connections' like the one shown below.
Teth Courtyard, Nelvaan, and Rattatak introduced a wrinkle that sees a bit more play. From square 2 one might consider the possibility of LOS down the entire row containing square 1. The "single dot corner" LOS is in important places on the these new maps and becomes a factor (if not an exploitative one) that needs to be clarified explicitly.
Additionally, Chris West said his understanding was that LOS would be very limited or non-existent in the case when designing the map, so there's some serindipity in the change as these maps work a bit more as intended.
And further additionally, players in general have had a tough time understanding the corner is just the actual corner, not the whole triangular area between the grid lines and the beveled wall corner. It's hard to misunderstand the new way.
The real problem has existed pretty much forever in the situation below. It's due to beveled corners being used on thin walls rather than a solid wall block. All of a sudden a character can be in square A "inside" the beveled corner. And like the examples above, he can legally draw LOS through the corner marked with the green dot, making B, C, D, and E legal targets. Effectively shooting through walls.
Mos Eisley and Bespin offer significant abuse of the situation.
There is the noted new situation of the "bunker" created on Teth Monastery where a few squares in the right starting area are unattackable when a character is placed in them. In the short term, if you don't want to give your opponent access to such a bunker, don't bring the map as your opponent will get side choice. In the longer term, DCI will keep tabs on the situation and remove the map should the abuse be too great. The map has been rather unpopular (from a gameplay perspective) in its short time as DCI legal anyway.