ADC: Twitch, Lucian, Draven and Caitlyn are still considered top picks/FotM. Vayne has fallen out of favour since she can't deal well with most FotM picks and stronger engage supports - she's still played a lot but is no longer god tier that she was in S3. Kog'Maw is played in the LCS but not in yoloqueue since you heavily rely on your team to peel for you. He's actually the least picked ADC if you don't count Urgot. Jinx is super popular but isn't considered god tier since lack of a dash/escape prevents her from solo carrying games as hard as, say, Lucian and she doesn't have Draven's god tier damage.
Support: Thresh, Leona and Morgana are still the undisputed top 3. Nami is catching up in popularity. Karma was considered super strong for a while, but she falls off hard in utility past the laning phase - she mostly offers an AoE speedboost and an OK slow with her Q, no-where near the other 4. Pretty sure this was brought up in the previous thread.