It's good to keep in mind that these are theories. Right now, there are two interesting Jubilee theories, one claiming 2015 as the year of Jubilee, and one claiming 2017.

Will the next Jubilee be the 70th Jubilee, and will that bear greater significance, because of the importance of the number 70 in prophecy?

For whatever reason, there is growing consensus that we are rapidly approaching the end times. I would suggest that we are already in the "beginning of sorrows". The key event will be the "abomination that causes desolations."