Today, Cardinal Muller, Prefect of the Congregation for the Doctrine of the Faith, has issued new guidelines for marriages for those who attend Mass said by priests of the Society of Saint Pius X. (Read the report and text of the letter on Rorate Caeli here)
The guidelines call for the local ordinary to grant faculties to the SSPX priest to officiate as normal. Bishops (and episcopal conferences) may also require a priest of the diocese (i.e. the territorial parish priest) to perform the Rite of Matrimony (provided it's the traditional rite) while allowing the SSPX priest to say the Nuptial Mass right after.
In another words, it calls for a sloppy wedding day. Why would a Novus Ordo priest bother coming into an SSPX chapel for five minutes to receive vows of a couple he doesn't not know or care for the salvation of their souls, and leaves like Elvis to allow the SSPX priest to say the Nuptial Mass as normal?
I know in the Traditional rites of the Church the administration of the other Sacraments are separate from the Holy Mass (except for Holy Orders), which is why the marriage ceremony is conducted before the Nuptial Mass itself. In extreme circumstances the rubrics allow for vows to be received by a deacon in the absence of a priest, with the understanding a priest will say the "Mass for a Bridegroom and Bride" at a later date. But these arrangements are not much different than weddings performed in certain countries where a religious ceremony is not a legally-binding contract, and vows also must be exchanged before civil authorities in order for the marriage to be legal.
At the end of the day, if Bergoglio actually grants the SSPX official status and gets rid of Summorum Pontificum, don't expect a diocesan priest to say the TLM they're already saying, never mind weddings. This is just another scare tactic for Traditionalists to go to the Novus Ordo.