"Volumes" become odd when Marvel decides to re-number.
You could consider Fantastic Four (2004) to be Volume 1, as the numbering returns, with a similar story for Fantastic Four (2011) - it also can be considered a return to Volume 1.
Volume 2 was the ill-fated "Heroes Reborn" experiment with Volume 3 the "Heroes Return" to the 616 Universe.
Volume 3 had "double numbering" starting with issue #42 (Volume 3 - aka 471 in Volume 1 numbering), so they did acknowledge issue #500 with the 71st issue of Volume 3 (in fact, with issue #500, the "old" numbering was primary, with the Volume 3 numbering secondary - a reversal of issues #43 to #70 where the Volume 3 numbering was primary and the "old" secondary).
Volume 4 was a re-set to "old" numbering, story continued from Volume 3.
Volume 5 is the re-set to Fantastic Four, from the end of Volume 4 plus the first 11 issues of FF (2011).
The oddity is that FF (2011) still continues, and has its own #12 and onward.
UPDATE: November 22, 2012
Volume 5 ran from issue #600 to issue #611.
Volume 6, Fantastic Four (2012) starts over with a new #1, as has FF (2012).
FF (2011) is now at issue #23 in December 2012. Look for a re-re-numbering of Fantastic Four to get to issue #700. Adding together Fantastic Four and FF, you start 2013 with 612+12 = 624 issues, 76 away from #700 - if both FF and Fantastic Four keep publishing monthly, that would be 38 months to issue #700, or about 3 years and 2 months - putting us in about February 2016.
Series
|
Issues
|
Total Issues
|
"Full FF" Numbering
|
Fantastic Four (1961) V1
|
1-416
|
416
|
1-416
|
Fantastic Four (1996) V2
|
1-13
|
13
|
417-429
|
Fantastic Four (1998) V3
|
1-79
|
79
|
430-508
|
Fantastic Four (2004) V4
|
509-588
|
80
|
509-588
|
FF (2011) V1
|
1-11
|
11
|
589-599
|
Fantastic Four (2011) V5
|
600-611
|
12
|
600-611
|
Fantastic Four (2012) V6
| 1+ | N/A | 612-? |
|