There are a few around, and they will at least try for Graf, but they think he'll ultimately sign for a big-market US team. TB or Vegas could be in there as well.
As you mentioned, his teammate Quillan is there, but Boston is the only team I've seen mentioned with him.
I posted a few pages back about Veremyev of CC, who I'd go for, but he may stay another year, given that he hasn't signed yet.
Euro-wise: Tysplakov is the big fish, but there are others.
Former CBJ Calvin Thurakauf is rumored to be looking to return to the NHL after a very good season in the NL.
Eliteprospects.com hockey player profile of Calvin Thürkauf, 1997-06-27 Zug, SUI Switzerland. Most recently in the NL with HC Lugano. Complete player biography and stats.
www.eliteprospects.com
CBJ currently holds his rights, but he'll be free on June 30th.
Eliteprospects.com hockey player profile of Jakub Rychlovský, 2001-08-07 Vrchlabi, CZE Czechia. Most recently in the AHL with Grand Rapids Griffins. Complete player biography and stats.
www.eliteprospects.com
Is another attracting attention.
Eliteprospects.com hockey player profile of Oskar Stål Lyrenäs, 1998-03-23 Umeå, SWE Sweden. Most recently in the SHL with HV71. Complete player biography and stats.
www.eliteprospects.com
The numbers may not look great, but the speed and the shot are there. If they miss out on Typsplakov, he would be a good alternative.
And the sneakiest one...
Eliteprospects.com hockey player profile of Alexander Suvorov, 2002-11-30 Buda-Koshelyovo, BLR Belarus. Most recently in the VHL with SKA-Neva St. Petersburg. Complete player biography and stats.
www.eliteprospects.com
With the KHL timing and contracts are everything. Suvorov didn't play this past season due to a shoulder injury, but that wouldn't stop me from looking into this one very hard. He has no contract as of now, which means he could sign with an NHL club now, and beating a potential Kuzmenko-like derby for him in the coming years would be preferable.
Sign him, then loan him back to a KHL for a year.