I Have no clue! i know my pr has not went up ? tho about 2 months ago one of my sites went down in pr ten mins after i submitted to dmoz and most every engine that trafficseaker 7 supports!! and has not changed since! dont know if I did something wrong submitted 2 often or submitted to many pages or what! hope i dont get black listed/banned!
I don't know if it will update in Aprilal but may update in April according to http://www.seocompany.ca/pagerank/page-rank-update-list.html