Justin Timberlake has planned a companion album for the just-released The 20/20 Experience, but won’t say yet when it will come out. Last night during an album release party in LA, Timberlake said the 20/20 we’ve heard is just “the first half of the album” he’s been working on. “I’m not giving you a release date” for the second, he said. Questlove, the noted album-alarm-ringer who performed with Justin last week on Fallon, says 20/20’s second half will arrive this year. “Spoiler alert. 20/20 Vol 2 comes out in nov. (10 songs now…..10 songs later= 20 vision),” he wrote yesterday on Okayplayer’s message board, where he called 20/20 “OVERLY ambitious” before praising Timberlake and collaborator Timbaland for having “the balls it took to make this record.”