It depends. If/when are you coming on vacation?
There’s three parts to be considered: the Ordinary of the Mass, the Propers (Collect, Prayer Over the Gifts, Post-communion Prayer), and the Readings (First Reading, [Second Reading], and Gospel).
Let’s dispose of the Readings. They come from the Lectionary. That hasn’t been revised so they won’t change.
The Ordinary and the Propers have changed. If I understand the situation correctly in USA, you will start using both on 1st Sunday of Advent, November 2011. In England & Wales, our bishops have decided that the revised translation of the Ordinary will come into use next weekend: the first weekend in September. The revised Propers will be used frm the first weekend in November.
So, if you’re in England or Wales in September or October you’ll find the responses different from the ones you’re using in the USA.