re: filing deadlines 10/31 and beyond...
Exactly. Anyone saying she can get in beyond 10/31 I’d be suspicious of wanting her demise. The bottom line, though, is Sarah and her team are so far playing their cards correctly, IMHO, and plan her entry sometime prior to 10/31.
She's on record as saying that she'll have to let everyone know what her intentions are in late September - early October. Now that she's been mum about what she's doing this long, it's a virtual certainty that she'll announce her bid for the nomination shortly.