For some reason G'MIC only shows 394 available filters. Even when i refresh. Do i need the 64 bit version to correct this? I am running a 64 bit system now. I have version 1.5.8.6

From 1.5.8.6 onwards filters under the "Testing" branch aren't in the total, so 394 sounds about right

Exactly.
(now 402 after refresh in Gmic 1.5.9)

According to me, the actual number of filters to GMIC 1.5.9.0 beta (as of 2014-05-10) = 685 (without additional information " About ").

MareroQ: that's true as far as the list of available filters is concerned.
But if you look at GMIC panel (once opened) you see Available Filters 402, because the "testing" group is not counted

This is the decision of the Author - now would be the lack of information about the new filters in the Testing (why?).
A page from the current list of filters http://gmic.sourceforge.net/gimp_filters.txt:

- List of filters, sorted by path,
- List of filters, sorted alphabetically.

Unfortunately still missing: List of filters, sorted by date!

Agree.
It could be useful to have the list sorted by "date last update" (just to have a try on new or revised filters)

I currently have 395 filters that can be used.. not sure about the others. I'm using G'MIC 1.5.9.0 the latest one on Windows 7 64bit.

Thanks for the new information. Also thanks to Pogo for the newest 64 bit 1.5.9.0 beta version.
Works excellent and the newer larger preview is fantastic David.