By Merrill Reese: Heading into this season it was tough to gauge this Eagles team.  After four games here’s what we know:  They’ve got some areas of real concern but they also have some blue chip talent.  Along with that they have heart.  All three of their wins featured last minute drives and Sunday night they were turnover free.  It’s still too early to figure out how far they can go, but as they head for Pittsburgh they’ve got some positives on which to build.