does anyone know if there are any more small or big box expansions slated for 2015?

None have been announced yet, but if things go as they have for 2013 and 2014, I would expect so. You can check the news on this site by limiting your news category to D2E.

yes. as the last thhree years: one big box one small.

first: a revisited base box is 10 times more likelier than a 3rd. edition.

second: dont forget that the second coop module Nature's Ire was already released and I am pretty certain it wasn't the last Coop module

third: it is probably that they have a slight focus shift towards getting Imperial Assault out of the gates, then get back with more descent stuff; Manors of Ravens and the Third Heroes and Monster Pack just got released and the forth heroes and monster pack is soon to be expected.

a user on BGG put it wisely:

Zaltyre, on 13 Oct 2014 - 10:34 PM, said:

Let's also not forget that "Descent is slowing down" is a relative statement in the wake of a a wave of releases that had (at least myself) oversaturated with Descent material. The third of the four announced H&M packs was just released, so we're still waiting for Guardians of Deephall, and Manor of Ravens is pretty fresh. There may not be a bunch of announcements recently, but take a look at the timeline:

Jul 2012: Base game released

Dec 2012: Lair of the Wyrm released

(2012 had the base game and a small expansion)

July 2013: Labyrinth of Ruin released

Oct 2013: Trollfens released, Nerekhall announced

Nov 2013: 1st 6 lieutenant packs released

Dec 2013: Valyndra and Bol'Goreth released

(2013 had a big box, a small box, and 8 lieutenant packs)

While so far 2014 has seen: 1 big box, 1 small box, 9 lieutenant packs, co-op play, and 3 hero and monster packs (with another on the way.)

It's not exactly coming to a screeching halt, is it? I agree with DAMaz's point that this may be a temporary shift of focus. Whatever the cause, I'm not upset by the lull- it gives me time to catch up to all of the new content.

So we have one big box and a small box plus some miniatures per year. thats the same amount as Talisman.

sadly this means the next big box may come not before July 2015.