Future Release possibilties:

rebuild statement constants
look at all pragma statements

SQLite API:

authorizers
loading of extensions -- readfile / writefile
utf-16 integration
create_collation
encryption key support
expose sqlite3_strnicmp
table name and column name in a type map?
type conversion for manifest typing? how to allow it through?
explicit pragma handler
application_id pragma setter

Non backwards compatible changes:

change the schema objects to be more consistent
change taps to use to_proc protocol
convert type dependency to just use 'call'
integrate transaction and savepoint under the same api

SQLite Features:

activate SQLITE_ENABLE_ICU extension
activate SQLITE_ENABLE_LOCKING_STYLE
activate SQLITE_ENABLE_UNLOCK_NOTIFY
expose PRAGMA foreign_keys
virtual file system
full text search (FTS3)
expose the sqlite mutex lib
statement status ( sqlite3_stmt_status )
db status ( sqlite3_db_status )
library status ( sqlite3_status )
sqlite3_index_info
sqlite3_create_function has 4th parameter SQLITE_DETERMINISTIC
sqlite3_rtree_query_callback()

Drivers:

data mapper driver
sequel driver optimization

Features:

Think about moving from arrayfields to ordered hash?
add to command line which directory to pack into a rubylibs table
amalgalite command line tool
use ruby's ALLOC_N and hook into sqlite3_mem_methods

Functions to possibly expose:

sqlite3_backup_remaining, sqlite3_backup_pagecount
sqlite3_compileoption_used, sqlite3_compileoption_get
sqlite3_config
sqlite3_data_count - returns number of colums in the result set of a prepared statement
sqlite_sourceid, sqlite_source_id
sqlite3_strnicmp