Here is an article speculating about what this latest filing in the Flynn case means. Reading the tea leaves in this situation can be challenging, but there is reason for the Flynn side to have hope
" ..... Late yesterday, Judge Sullivan entered an order directing the government to file a surreply brief by November 1, 2019, but in doing so instructed prosecutors to address not just the Brady issues, but any “new relief, claims, arguments, and information raised in Defendant’s Reply Brief.” ......
Whether Judge Sullivan will schedule oral argument after receiving these latest filings is yet to be seen. And how he will rule is anyone’s guess. But that Judge Sullivan did not limit the additional briefing to specific Brady issues, but instead directed the government to respond broadly to any “new relief, claims, arguments, and information,” suggests the long-time federal judge’s concern has been piqued by what he’s read so far."
Judge Demands Reply To Allegations It Hid Evidence From Michael Flynn