All i know is that they had see-through skin. Do they have pointy ears? Gills? Can they breath/walk on land? Can they talk?

On a side note, are they even around anymore?

Well they appear in ESO , and there is nothing that implies that they are somehow gone during 4th era . Someone posted picture of them but it was in poor resolution, they seemed to have greyish/whitish skin color and general mer apperence.

http://images.uesp.net/3/39/ON-concept-Ancient_Elf_Armor.png is the concept art of a Maormer in armor.

Here is more info about them if you want to do some quick reading:

http://www.uesp.net/wiki/Lore:Maormer

My, those are awfully round ears for a Mer. You sure that's not just an Imperial in Maormer inspired armour?

The wiki page I linked says it is a Maormer in armor, so I thought it was

http://api.ning.com/files/IvqemBCauJE*A4i8C22JGpgS-1ILGQdZFksvYpnPSWfd*skRnU3IykZUB15CZ03yApzKs8lPU1Sa7b8WVzDqmMZqLkxMV4Ze/maormer.png

I would hope.

Not sure if "you can't make buildings out of poetry" ESO agrees.

ESO went overboard with lore (there are Chimer running around! Sheogorath the in-your-face easter egg! Temple of CHIM!), but they were pretty spot-on with the sea elves.