Id think theyd want a couple solid young pitchers which the cubs don't have much of to be trading away and im sure they'd want a couple of their top hitters like Almora, etc..
What gives you that impression? Julio Teheran is 23 and just put up a 3.2 fWAR season. Alex Wood is 23 and just put up a 2.5 fWAR season. Lucas Sims is their #2 prospect and probably a #3 starter and maybe more. Including Sims 6 of their top 10 prospects are pitchers(also 6 of their 11-20). Mike Minor had a rough year but he's 26 and the previous year he was a 3.5 fWAR pitcher. Seems to me that have a crap ton of young pitching. They might need to fill out some of the back of their rotation with some vets but Teheran has ace potential and may already be there.
On the other hand, what they don't appear to have is positional players. Andrelton Simmons is a pretty good young SS but he's not going to carry a team offensively hitting .252/.298/.373 over 1400 PAs. Freddie Freeman is a very good 1B. And then you presumably have one of Upton/Heyward to slot in. But after them? Evan Gattis is 27 and had a good year but some think he'll be trade bait since they have Bethancourt coming behind him. Maybe you buy into Chris Johnson's 2013 campaign but that's pretty iffy since his next highest season was 1.3 fWAR. After those guys no one tallied more than 0.3 fWAR and as I mentioned, their hitting prospects leave a lot to be desired.
It's hard to estimate what the trade market will be but there aren't many teams that even have that many top 50 hitting prospects. The following teams have them based on mlb.com's rankings
Twins - Buxton, Sano, Gordon
Astros - Correra, Santana
Indians - Lindor, Frazier
Texas - Gallo, Alfaro
Dodgers - Seager, Pederson
Padres - Hedges
Red Sox - Swihart
Pirates - Josh Bell, Meadows
Phillies - J.P. Crawford
M's - Alex Jackson, D.J. Peterson
Cubs - Bryant, Russell, Almora, Soler
Royals - Mondesi
Rockies - Dahl
Reds - Winker
Of the teams with more than one top 50 hitting prospect the two that make the most sense are the M's and the Cubs to me. Twins and Pirates probably have the same trouble re-signing him. Dodgers already have 4 good OFs. Astros have Springer and Santana as corner OFs. Perhaps Texas and Cleveland. Of the other teams, the Pads, Royals, Rockies and Reds all seem to have other money issues already. Perhaps the Sox and perhaps the Phillies though I don't think the phillies have much of a system atm.
I could see a deal happening around Villanueva/Candelario + one of the top guys and then some filler pieces at the back. Not to consistently shit on Baez but for the sake of argument they could use a 2B who can hit. If you throw out Baez + one of Villanueva/Candelario that should be enough to at least get the conversation going if not be enough alone. From their perspective you'd be getting potentially a star in Baez and either 3B would instantly become their best 3B prospect of which the guy they have starting is 29 this year. Same idea works to an extent with Alcantara.