Currently I'm on a BGEE run with a party that I plan to import into SoD once it's released. For my first playthough of SoD, I'm thinking about taking exactly the party that has defeated Sarevok, was victorious in the Durlag's Tower and the Werewolves' Island, with all items and abilities on the party's NPCs as I want them.
The latest Dragon+ interview about SoD includes a new screenshot, with what was confirmed to be a neutral party for SoD: Khalid, Dorn, Jaheira, Safana, Neera (https://forums.beamdog.com/discussion/comment/656010/#Comment_656010)
. So Safana is a thief in the neutral SoD party.
Other screenshots, avalable at http://www.siegeofdragonspear.com/
, also have Safana. We still don't know which BG1 NPCs will be available in SoD, and what good or evil party for SoD will be, but on this forum an idea has been shared that Imoen won't be available as an NPC in SoD (or, at least, for a major part of SoD), becoming a quest figure instead.
And it has struck me that my party (the canon BG1 party of Jaheira, Khalid, Imoen, Minsc and Dynaheir) actually has a thief (who also is dualled into a mage, with precise planning of thieving skills, and lots of learned spells) that presumable won't be available in SoD, so that I will have to take another thief, with Safana the most likely option). Glint Gardnersonson will also be an option, but you can't influence his skill distribution in BG1EE.
In my case, if Imoen really won't be available, I will lose all that has been put into her, instead getting another NPC with thieving skills I didn't distribute and without a wizard part (because it requires the INT tome).
Of course, it won't be a BIG deal, but still it is needed to be considered.
So, if anyone else has the same concerns, maybe it's better to include Safana into your pre-SoD BG1EE party which you're planning to import into SoD (you could even dualclass the moment you exactly want), so that in SoD you had a thief with that skill distribution you consider the best (maybe you like setting traps, for example, and like to put 100 into ST).
As a bonus for Imoen, though, I'm awaiting for those dialogues and events explaining why she can't continue with Charname in SoD.