So you are asking us to predict whether any future kernels will be LTS? Probably... Which ones? No-one knows.
Report a bug.
It is very unlikely.
There was a stuff up in the community SVN. Should be regenerating the ABS tree now.
RemoteFileSigLevel = Optional
File a bug: bugs.archlinux.org ... It seems it was missed in the rebuild.
Will require pacman-4.1 before this really gets done.
Hrm... I have no idea what is causing this then.
-D_FORTIFY_SOUCRE has moved from CFLAGS to CPPFLAGS so you need to deal with that. I will be rebuilding it in the next day or two anyway.