There's a very good chance. Remember, these aren't, "Black Friday" deals per se - they were announced in a press release a week in advance and extend well past Friday. These are the usual, "Why wait until Black Friday when you can save NOW" junk deals may retailers are running ("Black Friday Presale", "Mid-Black November Clearance", etc.). The Black Friday deals will appear on the Sprint website on Black Friday.
Last year Radio Shack had the Galaxy S 3 for $49.99 w/2-yr contract which is the same deal Sprint had. Expect similar deals this year across the board to clear out the phones that aren't Spark capable. If Sprint follows Radio Shack's lead, keeps their $50 price tiers and prices phones to maintain their relative positions (ie. an S4 will have to sell for more than an S3 but less than a Note 2) BF on Sprint.com should look something like this:
Galaxy S 3 $0 w/2-yr contract (Sprint's current deal for new customers)
Galaxy S 4 $49 w/2-yr contract (Radio Shack's BF deal)
Galaxy Note 2 $99 w/2-yr contract (Radio Shack's BF deal)
Galaxy Note 3 $149 w/2-yr contract
HTC One $99 w/2-yr contract (Sprint's current deal for new customers)
Moto X $0 w/2-yr contract (Sprint's current deal for new customers)
All carriers tolerate their legacy plan customers with various levels of disdain. Be thankful we haven't reached Verizon's, "You can keep unlimited data until you upgrade your phone" level. Sprint has recently (last week or so) fixed their web store so that SERO customers can order phones without having change their plans so that's something.
