You went a couple of years before me. Sumatra is an amazing place there can't be many better places for those who like thier Volcanoes, Earthquakes, and Tsunamis. To be fair those who like a good storm are well catered for as well got one of those whilst in Bukit Lawang that was biblical, I have never seen so much lightning or as close! All the locals were shitting it, as were most of the backpackers....i should have been and would normally have been but one this occasion was buzzing my tits off for the duration.
Also got shook out of bed by a huge tremor whilst in Medan one night, have experienced some pretty violent tremors in the Greek Islands over the years but the one in Sumatra was the real deal, and that did shit me up.
Wild place I doubt its changed much, not a place for the faint hearted but if you like a bit of adventure, and the odd helping of significant danger then Sumatra is a must visit.