Will LoL Classic have old rune pages?
Yes. Riot's official League of Legends Classic page shows the old rune-page interface with marks, seals, glyphs and quintessences.

Riot has now detailed how old rune pages and 30-point mastery trees unlock in LoL Classic. Progression is faster than old League and everyone gets a usable default page.

Runes unlock by playing and use old Tier 3 strength as their baseline. Players start with three Rune Pages, earn two more from Classic Levels and can buy extras with returning IP.

Riot's preview shows a 21/0/9 allocation across the classic three-tree layout, confirming the older mastery system's return.
All Mastery pages and points are fully unlocked at Classic Level 4. A default page prevents players who forget setup from entering substantially underpowered.
Yes. Riot's official League of Legends Classic page shows the old rune-page interface with marks, seals, glyphs and quintessences.
Yes. Riot's official Classic gallery shows a 30-point mastery page organized into Offense, Defense and Utility trees.
You unlock them by playing Classic. Runes use old Tier 3 strength as the baseline, three Rune Pages are available at the start, two more come from Classic Levels, and all Mastery pages and points unlock by Classic Level 4.