1) I dislike the new religious civics. I don't see any reason to switch out of Cult of the Sea once you get Fishing. The lack of state religions also makes the diplomacy side of the game extremely boring. Wars are rarer than normal and diplo wins are easy.
2) The pop-up when new religious civics are available says they give +20% but everything else says 15%.
3) I dislike the changes with the wonders. Although I don't know if it's because they're different or they're poor ideas. I'll think about it some more.
1) There are reasons to switch out of Cult of the Sea, depending on Civs and resources. Cult of War prepares a better army, cult of fire boosts wonder/building production. I frequently switch cult. Cult of Sun seems a bit lower the others.
Diplo wins aren't easy at all. I never reach them.
The lack of state religions is under investigation. Next xml patch will fix it.
2) Tips, Pedia and whatever text will be fix in the final release
3) I think because they're different. Now wonders follow their historical timeline:
BUILDING Year
BUILDING_STONEHENGE -2500
BUILDING_PYRAMID -2500
BUILDING_SPHINX -2500
BUILDING_DODONA_ORACLE -2000
BUILDING_GREAT_ZIGGURAT -1200
BUILDING_ORACLE -1000
BUILDING_HEROIC_EPIC -800
BUILDING_NATIONAL_EPIC -750
BUILDING_HANGING_GARDEN -600
BUILDING_KROISOS_RICHES -550
BUILDING_AGORA -500
BUILDING_CIRCUS_MAXIMUS -500
BUILDING_ARTEMIS_TEMPLE -450
BUILDING_PARTHENON (Zeus) -433
BUILDING_HYPOCRAT_OATH -430
BUILDING_PLATO_ACADEMY -400
BUILDING_MAUSOLOS -350
BUILDING_ARISTO_THEATRE -350
BUILDING_COLOSSUS -300
BUILDING_GREAT_LIBRARY -300
BUILDING_GREAT_LIGHTHOUSE -280
BUILDING_GENIUS_ARCHIMEDES-250
BUILDING_ILLYRIAN_CITADEL -250
BUILDING_GOLGATHA 30
BUILDING_HADRIAN_WALL 130
BUILDING_HOLY_EMPIRE beyond 550
About effects, main goal was to reduce massive culture and GP spread in mid-late game. The seven (historical) ancient wonders are more valuable now.