Would be really nice to see security augmentations to the language. The vast majority (maybe 9/10) sites I look at where no framework was used, the site is missing have no CSRF tokens, very poor XSS protections, and RCEs are pretty common too. I think this would really improve the language.
The argument that 'PHP is a framework' may be valid, but as a framework, raw PHP kind of sucks.
An example would be built in CSRF protections through something like a form builder
http://blog.ircmaxell.com/2014/08/introducing-recki-ct.html
(it's vaguely redundant with the readme, but there is some additional stuff)
Globals, sure, bad practice. Ideally we wouldn't have any. Dynamic variables make sense to exclude, it turns static analysis into the halting problem. Luckily they're a bad practice too since 5.3 introduced closures.
But references?
EDIT: It's by Anthony Ferrara! and some other pretty big names in the PHP community