According to Andrea Tornielli in this Thursday's La Stampa, all documentation is being readied up in order for Pope Benedict XVI to proclaim Blessed Hildegard the new Doctor of the Church in October 2012, that is, during the "Year of the Faith".
Since she is still, at least officially and for the Universal Church, considered a Blessed, it is possible that there be something similar to what happened to Saint Albert the Great in 1931: a nearly simultaneous instant-canonization and proclamation as Doctor of the Church.