yes you will, many people are upset that once the new world opens and the level cap is raised all the experience they earned but did not recieve because of the current level cap will place them behind those who do the spryre this summer and keep all their experience
i beat malistaire and i am a lvl 46 wil i have enough side quests for grand
If you do all the side quests as you go up in levels, you should hit level 50 somewhere around the crystaline grove...maybe before if you did quests twice to help friends, etc.