To summarise changes to the ISO Spanish layout:
alt gr (though arguably
AltGr is more correct if less consistent)
The ¡ on the
¡ups! key is important, I feel. Whilst many people in modern Spanish leave off the ¡ in standard informal texts (chat, email and even @Emili above) it is more correct, especially in formal text to do so. Whilst I realise we're going for a friendly semi-formal tone for the V, the ¡ should stay.
Those of you who don't have a differentiation between formal and informal in your language, think of it as the difference between saying "you're" on a keyboard and deciding to replace it with a "ur" key, as that is the way the txtspeakers do it.