Whoa that's big news (and I wonder how long it'll take for Swoop to be axed from all but WPVI's Autumn opens lol). I hope ETN and CSN split the production duties of the preseason games. It would be cool to have the SNF look to them. ETN hasn't had the best of graphical looks for games over the years.
The Eagles could very well be on 3-4 (maybe 5 or 6 with flex scheduling) SNF games this year with how much attention they've drawn on themselves nationally and this market loooooves their football team so I'm sure 10 and CSN will have that covered.
As for WWSI, in theory they could (big could) a Spanish language TV simulcast for preseason games only. You can't do it for regular season as they're not a rights holder. The Eagles do have a Spanish radio network that is available through SAP.