Odds of getting a standard 1BR at Jambo if you reserve right at 7 months out varies depending on time you want to reserve:
-- From the Monday after marathon weekend in Jan to late Sep,
DVC's low to moderate demand season at WDW, the standard 1BRs have been open about 99% of the time, including holiday times.
-- From late Sep to marathon weekend in Jan, DVC's high to extremey high demand time, it is generally 50/50 -- there can be some times when they are open even for a week but then others missing one or two days in a week, and then even missing more during DVC's extremely high demand times, the Thurs before Columbus Day to the second weekend after Columbus Day, the Thurs to Sun of the Wine & Dine race weekend in early November, the Thurs to Sun of the last weekend of Food &Wine just before mid-Nov, the Tues through Fri of Thanksgiving week, the first two weeks of Dec, Dec 23 through Jan 1, and the Thurs to Sun of marathon weekend in Jan.
As to odds of getting pool view if you request it when you have standard view, I do not have any figures except the only time I have seen anyone mention being somewhat disappointed is when they requested a different area to get a savanna view with standard and ended up with the pool view.