I'm looking forward to 4 albums right now:
Alice Cooper - Road
Greta Van Fleet - Starcatcher
Mammoth WVH - Mammoth II
Steven Wilson - The Harmony Codex
That being said, I don't know if Steven is actually releasing it this year.
Earlier this Year:
Anthrax w/ Black Label Society & Exodus
John Mellencamp
Alter Bridge w/ Mammoth WVH
Upcoming:
Dream Theater w/ Devin Townsend & Animals as Leaders
Volbeat w/ Halestorm
WASP w/ Armoured Saint
Iron Maiden w/ Ateryu
P!NK
Bruce Springsteen
Potentially:
Bryan Adams w/ Joan Jett
Ghost w/ Amon Amarth
Greta Van Fleet w/ Kaleo
Avenged Sevenfold w/ Alexisonfire
Billy Idol
Pat Benetar
City And Colour
Sting
Skid Row w/ Buckcherry
Guns N Roses w/ Alice In Chains (GNR Maybe twice)
Kiss
When I saw them for the first time on the LOTB Tour Aces High blew me away as an opener, but I'm sure when I see them later this year it may be dethroned now...