All right i have gotten 1 step further.
I have managed it to update when scrubbing in the viewport atleast.
Its based on Goldisart image.
I work in compact material editor most of the time. I find it cleaner and faster.
Here is what i did:
1 - Open a new instance of 3ds max.
2 - Set the render engine to octane
3 - Select the first material slot and make it a Octane Diffuse shader
4 - Change the diffuse slot from color to texture
5 - Apply a RGB map
6 - In the "Filename" slot get your image sequence (Remember you check the sequence box when getting your image sequence)
7 - Now click on "Show shaded material in viewport" button. (Its the checker pattern with the little lightbulb)
8 - Scrub the timeline..... nothing happens.... go back to frame 0
9 - Now click the "Standard texture" slot under "Filename", here you have the option to apply a bitmap, as scanline does.
apply the bitmap and select the same image sequence.
10 - While innside the bitmap click the "Show shaded material in viewport" again.
11 - scrub the timeline...... nothing happens.......*damn*
BUT!!! here is the strange part.
If you now open the material editor in slate instead of compact mode.
then use the "pick material from object " eye dropper and get the material in to the slate editor.
Find the bitmap node and then click "Show shaded material in viewport" on and of (the button Goldisar have pointedout in his image)
if you now scrub the timeline!!! IT UPDATES!!......
So what i learned from this is.
If you want to display animated texture in the viewport using octane shader you need to use the standard texture slot with a bitmap. and you need to use the slate editor display texture button instead of the compact one........
Here is the sad part tho.
Even tho it now updates in the viewport..... it does not work with the viewport preview

("tools" -> "Preview - Grab viewport" -> "Create preview animation")
So i guess that concludes with what paride says about not beeing able to create a 3ds max preview.
really appreciate your time guys trying to help me out on this
-Mats