what you have is a lactobacillus infection. this can be done purposely like in the starter thread, but lacto grows everywhere and can easily infect if you're not sanitary in your practices. when i first used roselare yeast is when i became familiar with lacto and those weird bubbles; fyi roselare yeast is a seasonal yeast and a mix of lactobacillus, pedioccus and brett http://www.wyeastlab.com/rw_yeaststr...ail.cfm?ID=194.
from now on be sure to sterilize/sanitize well. and from what i understand a pellicle is from brett, so you don't have a true "pellicle" yet. now would be a good time to throw in some oak and brett and let this sit for a while, maybe in time you will have a pellicle