I expect a Lucas, Gerrard, Adam central midfield. Or maybe, just maybe, Gerrard will drop into the defensive midfield role and you'll see a Gerrard, Henderson and Adam trio.
Personally, if I was Dalglish, I'd set the Liverpool team as so:
----------------Suarez-----Kuyt---------------
-------------------------------------------------
---------Aquilani---Merelies--Gerrard-------
-------------------------------------------------
--------------------Lucas----------------------
-------------------------------------------------
Aurelio----Skrtel----Carragher---Johnson
-------------------------------------------------
-------------------Reina------------------------
Focusing on fluidity and Kuyt dropping back to make a flat midfield five in defence.
As for Arsenal, I'd set it up
------------Gervinho-----Van Persie------------
---------------------------------------------------
Arsavin-----Song-------Fabregas-----Rosicky-
-------------------------------------------------
Gibbs----Vermaellean----Squilacci---Sagna
-------------------------------------------------
-------------------Almunia *sigh*-------------
I expect Nasri to leave, but Fabregas to stay. Or Fabregas could go and Nasri could stay, or both could go. So the position of midfield playmaker is very much open to interpretation.