I really don't know where to begin. those jungle changes will really separate the good junglers from the great junglers (lol overused) it will build a lot more strategy into what camps you should be smiting and if you should save smite, such as smiting a champion with the stalkers upgrade or go for a more late game with gold generation or just clearing entire camps with Ranger's trailblazer, I though they made junglers more interesting last season it will be on a whole new lvl this season. the skirmisher's saber upgrade seems kind of useless kind of like the blue trinket in the beginning of season 4. but it is still pbe so there will be a lot of tweaking in the coming months. I am unsure of how nunu should be played in this new environment though like which should you consume and which should you smite? should make things interesting for him.
The changes to towers will really open the possibility of the 4man pushes again because of the shield and the no scaling armor/mr but will really hurt the fast push strat we are currently seeing. I think we will see more turtling because of the changes to inhib towers and base buffs.
objective control will be interesting and I think dragon won't be as important anymore because no global gold you will probably see LCS trying to push down as many towers as possible then later in the game when they have a gold advantage forcibly take drag for the buffs. I like the changes to items because I noticed the problem when you were in lane and had to invest in a negatron cloak when maybe a null magic mantle may have been enough, it will change how you itemize against champs.
Love the change to ohmwrecker it might actually be useful but we will see. they are going to have to find a balance between sieging and turtling with these changes because there is just so many buffs on both sides, like baron buff reducing damage to melee minions by 80% that with ohmwrecker and so many abilities focused on towers they will either drop way too fast or sieging the base will be more annoying than it is now.
so glad they are changing elixirs they were just so boring before. and the stat growth will be interesting will have to see how this impacts certain champs.
overall I am super excited for this way more than I was for season 4 changes.
