Automatic numbers superscripting in OS X Maverick and Pages 5
Not yet.  I would recommend staying with Pages 4 if that feature is important.  A workaround might be to add what you need to the Text Substitution section of system prefences using Unicode superscripts, but it may not work or look that great. 

ᵃ ᵇ ᶜ ᵈ ᵉ ᶠ ᵍ ʰ ⁱ ʲ ᵏ ˡ ᵐ ⁿ ᵒ ᵖ ʳ ˢ ᵗ ᵘ ᵛ ʷ ˣ ʸ ᶻ