I expect that the older tome weapons will be available for the new jobs.

Ilevel 140 gear will be a simple increase of stats similar to what has been done before (ie, +5 or so to main stats) so i130 will still be very good gear, used while grinding out your i140 stuff and leveling up to 60.

Level 60 will add stats to the character baseline. The increase in character level stats will, though, be much larger than the difference in gear with a +10 iLevel raise. At 60, the difference between i140 and i130 will be similar to what you have now between i130 and i120. If anything, it will seem smaller because it will be a smaller percentage increase (fixed amount).