It seems like an issue that maybe would be best addressed by browsers themselves; something like this is a nice solution! It changes the cursor on new tab links so you are aware if you are about to go to a new tab. Safari actually tells you when you hover a link "http://pie.yummy will open in a new tab", but its not super well highlighted.
To do it on site I think you can do something like this:
a[target="_blank"]:hover {
cursor: {CUSTOM NEW TAB CURSOR}
}
Im in favour of that; any way to make a site feel more dynamic is good in my books 
That's a cool thing, I'm gonna play around with it.

I found a bunch of
cursor options here too. I'm not seeing anything that'd intuitively indicate that a link will open a new tab, but I'm sure I can find something custom for that.