Gaga's lack of presence right now is very much intentional and all her own doing. There are covers coming and some other cool stuff, but it's not my place to announce. She renegotiated her contract, and one of the new things is that she decides how her promo is handled, where she travels/how often, etc.
She deemed her previous album promotion cycles as "senseless" and no longer wants to be pushed into something like that again after everything that went on with ARTPOP. This also goes back to