Should Goku get a new form?

[Saturnine]

That's not what he said. What Goku said: "This is a bit different. It’s tough to explain, but this is a Saiyan who’s a Super Saiyan with the power of Super Saiyan God"
Nothing here implies that a Saiyan can't go Yellow SS forms again at all. Otherwise Goku going regular SS in BoG doesn't make sense at all.

You may be right, but your argument ill-serves you - Goku going regular SSj during his fight with Beerus is because he hadn't even achieved SSj Blue yet. It was implied that it took a bit more than just absorbing the god power and then going SSj, some prior training was required too. And yeah, I do realize this contradicts the other lines but let's be frank, with so many writers and abruptly changed decisions it's only natural that the series is a clusterfuck.

[Spidder]

Enough with transformations!

Saiyans and Dragon Ball are all about transformations and powerups. Goku's been transforming and powering up since the very first saga. As for the form itself: maybe something Saiyan rage related, since that's been a theme lately (always). Maybe he picked up back-tingling from Caulifla.

[nitemare]

Goku (or anyone else) will most likely need a power boost to fight the ultimate boss which seems to be Jiren.

Having said that, if Goku were to gain a new form, I'd prefer it to be a refined form of SSG or Super Saiyan Blue. Not enough to call it a completely new and stand-alone form but distinguishable enough you know.

I certainly don't want to see them keep recolouring Super Saiyan until Dragon Ball becomes Power Rangers or something like that. It looks lazy, unoriginal and boring.